Error propagation between the reconstructed frames is a common problem in both traditional and learned video compression methods [1]}.
To investigate details of the error propagation, multiple frames are compressed by two methods (i.e., H.264 and flow-based learned video compression).
The PSNR values of the reconstructed frames are demonstrated in Fig. REF , and the values of these methods are high at the beginning of the group of piture [2]} (GOP).
While, as the GOP size increases, the PSNR values begin to drop from 35.24 dB to 31.05 dB for H.264 and from 34.41 dB to 31.324 dB for the flow-based method, which indicates the error propagation problem causes frames quality to degrade.
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